The One Above All is said to be a being who is as far beyond mortals as mortals are above cheese sandwiches. That being said, he has yet to get any feats to actually support this. Tsurugi also gets a lot of hype that he never actually lives up to, but he does still manage to fight when it counts. He could stab TOAA with his shield or just deliver a few punches and that would probably be enough to win here. He’s just more skilled than this cosmic being. Tsurugi wins.